diff --git a/daphne/apps.py b/daphne/apps.py
index 3a566ea..de104db 100644
--- a/daphne/apps.py
+++ b/daphne/apps.py
@@ -1,12 +1,13 @@
 # Import the server here to ensure the reactor is installed very early on in case other
 # packages import twisted.internet.reactor (e.g. raven does this).
-import daphne.server  # noqa: F401
-
 from django.apps import AppConfig
 from django.core import checks
 
+import daphne.server  # noqa: F401
+
 from .checks import check_daphne_installed
 
+
 class DaphneConfig(AppConfig):
     name = "daphne"
     verbose_name = "Daphne"
diff --git a/daphne/management/commands/runserver.py b/daphne/management/commands/runserver.py
index 0ebde5f..b2fd2ee 100644
--- a/daphne/management/commands/runserver.py
+++ b/daphne/management/commands/runserver.py
@@ -33,7 +33,7 @@ def get_default_application():
         value = getattr(module, name)
     except AttributeError:
         raise ImproperlyConfigured(
-            "Cannot find {!r} in ASGI_APPLICATION module {}".format(name, path)
+            f"Cannot find {name!r} in ASGI_APPLICATION module {path}"
         )
     return value